STUDY OF THE EFFECT OF ALUMINOSILICATE BINDER
CHEMICAL COMPOSITION ON PHYSICOTECHNICAL PROPERTIES
OF POROUS PERMEABLE CERAMIC
B. L. Krasnyi,
V. P. Tarasovskii,
and A. B. Krasnyi
Translated from Novye Ogneupory, No. 11, pp. 41 – 44, November 2011.
Original article submitted July 4, 2011.
Results are provided for a study of the effect of processing binder chemical composition on physicotechnical
and corrosion properties of porous permeable ceramic based on electrocorundum. It is shown that
physicotechnical properties of porous permeable ceramic depend both on chemical composition, and on speci
men firing temperature. Use of a processing binder of aluminosilicate composition makes it possible to pre
pare objects from porous permeable ceramic with high strength properties with low firing temperatures.
Keywords: porous ceramic, electrocorundum, aluminosilicate binder, acid resistance, alkali resistance.
Objects made from porous permeable ceramic are used
extensively today in various branches of production: filtering
elements, whose operation is specified by presence of excess
gas or liquid pressure; objects with a porous capillary struc-
ture, whose operation is based on use of capillary pressure,
arising at a liquid–gas interface; objects with special proper-
ties, for which during operation there is typically reaction of
the pore surface with a phase previously introduced or pass
ing through pore channels, and this intensifies physical and
chemical processes . Various areas of application pre
scribe requirements for creating objects with a varied
macrostructure. Classification of the macrostructure of ob
jects made from ceramic is provided in Table 1.
From the point of view of the volume of production the
most used are objects made from porous permeable ceramic
(PPCM) materials prepared from narrow fraction powders.
The microstructure of these ceramics is shown in Fig. 1. In
order to create objects with a microstructure shown in
Fig. 1a, firing at high temperature is necessary, with which
there is intensification of diffusion processes within a crystal
lattice, and due to these processes there is strengthening and
partial compaction of ceramic material. Objects made from
porous permeable ceramic as a rule have very high corrosion
resistance in corrosive media, and at operating temperature,
although production of these objects is connected with con
siderable financial expenditure.
In the majority of cases operating conditions are such
that from the point of view of economy it is desirable to use
objects with a microstructure shown in Fig. 1b. In order to
create ceramic with this microstructure narrow fraction pow-
der filler and processing binder are used . The processing
binder until recently has been plastic refractories or clays,
bentonite clays, liquid alkaline silicate glass, and phosphates
. Use of traditional processing binders has not made it
possible to create objects of porous ceramic materials exhib
iting simultaneously a set of physicotechnical properties, i.e.,
high resistance in acid and alkali, strength, permeability, and
low sintering temperature.
In order to resolve this task a set of processing binders
has been proposed that are represented by a combination of
those binders used traditionally with various additions or
specially synthesized binder systems. Results are provided in
this work for a study of the effect of composition of com
bined aluminosilicate binder on physicotechnical properties
of porous permeable ceramic. The granular filler used was
electrocorundum grade F240 produced by OAO RUSAL
Boksitogorsk (TU 3988-064-00224450–94). The chemical
composition of electrocorundum and processing aluminosili
cate binder are presented in Table 2.
The grain size properties of electrocorundum powder are
shown in Fig. 2. The ratio of components in a charge for
molding specimens of electrocorundum are: aluminosilicate
binder was 85:15 (wt.%). The temporary processing binder
used was from the firm Zschimmer & Schwarz GmBH, Ger
many, grade KB 2097, which was added in an amount of
Refractories and Industrial Ceramics Vol. 52, No. 6, March, 2012
1083-4877/12/05206-0405 © 2012 Springer Science+Business Media, Inc.
ZAO NTTs Bakor, Shcherbinka, Moscow Region, Russia.